Exchange 2003 and Outlook 2007 error

I have exchange 2003 server and one of my client is using outlook 2007 and while configuring his email account getting the following message

Mapi session "/o=EnhanceUAE/ou=First Administrative Group/cn=Recipients/cn= exceeded the maximum of 32 objects of type "session".
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kurajeshSenior Systems AnalystAsked:
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MASEE Solution Guide - Technical Dept HeadCommented:
First of all Exchange 2003 is EOL(End of life) and unsupported version of Exchange.
Please upgrade to a supported version of Exchange

Please check this for your error
https://support.microsoft.com/en-us/kb/2742012
kurajeshSenior Systems AnalystAuthor Commented:
any other solution
Miguel Angel Perez MuñozCommented:
Case you have event Id 9646 check this: https://support.microsoft.com/en-us/kb/842022

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